I'm not aware of any built-in Jira feature for this, apart from going through the History section of the ticket, which is not really practical. If you use Tempo, which is the time-tracking add-on, you can filter within Tempo to give you that info.
The other way, which I use, is via the REST API, where you can programmatically get the same History list, but let the code add up the logged time for each user.
Thanks Warren & Lime Trees Team for trying to help me.
Lime Trees Team,
If it is one ticket then i can certainly follow the way you suggested. In my case, i have thousands of ticket and i would like to know who has spent what time in one shot.
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